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UPSC Combined Geo-Scientist

Chemist

  • 3 descriptive papers
  • 200 marks each
  • 3 h per paper

Mains Paper I covers inorganic chemistry.

UPSC Combined Geo-Scientist, Mains · 2016 · Mains Paper I

Q9(c). Oxidation of iodide by dichromate

Question

Write down the ionic oxidation reaction for the liberation of iodine from potassium iodide in acidic medium by potassium dichromate.

Answer in brief

Cr₂O₇²⁻ + 14H⁺ + 6I⁻ → 2Cr³⁺ + 3I₂ + 7H₂O.

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CoversOxidation of iodide by dichromateRedox stoichiometry

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